'mesonic' originates from English, specifically from the word 'meson' combined with the suffix '-ic'; 'meson' ultimately comes from Greek 'mesos', where 'mesos' meant 'middle'.

'mesonic' developed from the modern scientific noun 'meson' (coined in the 20th century to name an intermediate-mass particle) plus the adjectival suffix '-ic', yielding the adjective form 'mesonic'.

Initially the Greek root meant 'middle', and when the particle name 'meson' was coined to denote a particle of intermediate mass the derived adjective 'mesonic' came to mean 'relating to mesons' rather than 'middle'.